Seed and seedling diseases in sorghum are more severe in which condition?

Seed and seedling diseases in sorghum tend to be more severe in poorly drained soils due to the increased moisture retention in these conditions. Excessive moisture creates a favorable environment for pathogenic fungi and bacteria, leading to an increase in disease incidence and severity. These pathogens thrive in waterlogged conditions, which can result in rot, damping-off, and other diseases that negatively impact seed and seedling health.

In contrast, well-drained, dry, or sandy soils usually allow for better air circulation, reduced moisture retention, and quicker drying of the soil surface, which can help mitigate the occurrence of seed and seedling diseases. Thus, the stressful conditions of poorly drained soils promote the proliferation of disease organisms, making this the correct answer.